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Digital Tachometer with 7-segment Display and LED Bargraph

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stuplja

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Hi everybody,

I builded an old Digital Tachometer with LED bar (https://archive.siliconchip.com.au/cms/A_102835/article.html) thanks to a few members from this forum (they posted schematic and soure code, https://www.edaboard.com/threads/22029/), so maybe someone can help me to rebuild source code to display the time instead of RPM.
For example, if I set mode 1 (No. of Cyl. 1 (4-stroke)), for 75Hz input it shows 9000RPM and for 66Hz 8000RPM, etc... and for 75Hz I want to show 10min, 66Hz 11.5min, 57.5Hz 13min, etc ... It's easy to do math, for this example it's: t(min)=750/freq(Hz), but I'm not sure where in source code to put and apply this operation.
This is something like approximate arriving time when you ride a bike, more RPM and you'll arrive sooner, less RPM and you'll arrive later ...
Let me know if somebody need Eagle files (sch and brd) for this tachometer and thanks for any kind of help or maybe some easier solution ...
 

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